Audio speaker



FIG. 1 is a front side perspective view of an audio speaker, embodying our new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a right side elevation view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

All features illustrated in phantom line (i.e., dashed lines) are expressly disclaimed and form no part of the claimed design. 

CLAIM The ornamental design for an audio speaker, as shown and described. 